package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import com.itheima.reggie.pojo.Dish;
import com.itheima.reggie.service.DishService;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.util.List;
import java.util.UUID;

/**
 * 处理文件上传下载
 */
@RestController
@RequestMapping("common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws Exception {
        //创建一个目录对象
        File img = new File(basePath);
        //判断是否存在该目录
        if (!img.exists()) {
            //不存在就创建
            img.mkdirs();
        }
        //原始文件名
        String originalFilename = file.getOriginalFilename();//abc.jpg
        //原始文件名后缀  .jpg
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;//dfsdfdfd.jpg

        //将临时文件转存到指定位置
        file.transferTo(new File(basePath + fileName));
        return R.success(fileName);
    }

    /**
     * 文件下载
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws Exception {
        FileInputStream is = new FileInputStream(basePath + name);
        ServletOutputStream os = response.getOutputStream();
        IOUtils.copy(is, os);
        is.close();
    }
}
